1. 2/10 & 2/ th Grade Agenda
Learning Objective: Learn about Friction
Collect HW: Reading & Notetaking p.172 – 173
Springs Scales Lab
Textbook Reading p
HW: Reading & Notetaking p.175 – 176
Reminder Science Fair Board due 2/24 (50 Points)

2. Daily Reflection
Prompt: Write your own definition of “Force”.

3. In Science, a force is a P____ or a P_____
ush
ull

4. Force can be described by S_________ and D_________
trength
irection

5. When two forces act in the same direction, they A___ togetherdd
The combination of all forces acting on an object is called the net force

6. Which way will this object move?
Unbalanced force will cause a change in velocity

7. A nonzero net force, which changes an object’s motion is Un_________ Force
balanced

8. Which way will this object move?
Balanced forces acting on an object do not change the object’s velocity.

9. Equal forces acting on one object in opposite directions are called B______ Force
alanced

10. Adding a force acting in one direction to a force acting in another direction is same as adding a P______ number and a N______ number.
ositive
egative

11. The overall force of an object after all the forces are added together is called N___ Force

12. For an object to stay in motion, a F_____ has to act on it.
orce

13. The force that one surface exerts on another when the two rub against each other is called … F________
riction

14. Friction act in a direction O_________ to the object’s direction of motion.
pposite

15. The strength of the force of friction depends on two factors
Type of surfaces involved
How hard the surfaces push together

16. How is friction useful in helping you walk?
Without friction your shoes would only slide across the floor, and you would never move forward.

17. What is static friction
The friction that acts on objects that are not mov______ is called static friction.
Because of static friction you must use ext_____ force to start the motion of stationary objects.
ing ra

18. What is sliding friction
Sliding friction occurs when two solid surf______ slide over each other.
When you stop a bicycle with hand brakes, sliding friction is stop______the bike.
ace
ping

19. What is rolling friction
When an object rolls across a surf______, rolling friction occurs.
Engineers use ball bearing to reduce the friction between the wheels and the skate________
ace
board

20. What is rolling friction
Fluids, such as water, oil or air are materials that flow eas______.
Fluid friction occurs when a solid object moves through a fluid.
Fluid friction is usually less than sliding fric______.
ily
tion